C++ NativeMovConstReg类代码示例

void CodeInstaller::pd_relocate_ForeignCall(NativeInstruction* inst, jlong foreign_call_destination, TRAPS) {
  address pc = (address) inst;
  if (inst->is_call()) {
    // NOTE: for call without a mov, the offset must fit a 32-bit immediate
    //       see also CompilerToVM.getMaxCallTargetOffset()
    NativeCall* call = nativeCall_at(pc);
    call->set_destination((address) foreign_call_destination);
    _instructions->relocate(call->instruction_address(), runtime_call_Relocation::spec(), Assembler::call32_operand);
  } else if (inst->is_mov_literal64()) {
    NativeMovConstReg* mov = nativeMovConstReg_at(pc);
    mov->set_data((intptr_t) foreign_call_destination);
    _instructions->relocate(mov->instruction_address(), runtime_call_Relocation::spec(), Assembler::imm_operand);
  } else if (inst->is_jump()) {
    NativeJump* jump = nativeJump_at(pc);
    jump->set_jump_destination((address) foreign_call_destination);
    _instructions->relocate(jump->instruction_address(), runtime_call_Relocation::spec(), Assembler::call32_operand);
  } else if (inst->is_cond_jump()) {
    address old_dest = nativeGeneralJump_at(pc)->jump_destination();
    address disp = Assembler::locate_operand(pc, Assembler::call32_operand);
    *(jint*) disp += ((address) foreign_call_destination) - old_dest;
    _instructions->relocate(pc, runtime_call_Relocation::spec(), Assembler::call32_operand);
  } else {
    JVMCI_ERROR("unsupported relocation for foreign call");
  }

  TRACE_jvmci_3("relocating (foreign call)  at " PTR_FORMAT, p2i(inst));
}

oop InlineCacheBuffer::ic_buffer_cached_oop(address code_begin) {
  // creation also verifies the object
  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);
  // Verifies the jump
  NativeJump*        jump = nativeJump_at(move->next_instruction_address());
  return (oop)move->data();
}

// Release the CompiledICHolder* associated with this call site is there is one.
void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
  // This call site might have become stale so inspect it carefully.
  NativeCall* call = nativeCall_at(call_site->addr());
  if (is_icholder_entry(call->destination())) {
    NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
    InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
  }
}

void CodeInstaller::pd_patch_MetaspaceConstant(int pc_offset, Handle constant, TRAPS) {
  address pc = _instructions->start() + pc_offset;
  if (HotSpotMetaspaceConstantImpl::compressed(constant)) {
#ifdef _LP64
    NativeMovConstReg32* move = nativeMovConstReg32_at(pc);
    narrowKlass narrowOop = record_narrow_metadata_reference(constant, CHECK);
    move->set_data((intptr_t)narrowOop);
    TRACE_jvmci_3("relocating (narrow metaspace constant) at %p/%p", pc, narrowOop);
#else
    JVMCI_ERROR("compressed Klass* on 32bit");
#endif
  } else {
    NativeMovConstReg* move = nativeMovConstReg_at(pc);
    Metadata* reference = record_metadata_reference(constant, CHECK);
    move->set_data((intptr_t)reference);
    TRACE_jvmci_3("relocating (metaspace constant) at %p/%p", pc, reference);
  }
}

void CodeInstaller::pd_patch_OopConstant(int pc_offset, Handle constant, TRAPS) {
  address pc = _instructions->start() + pc_offset;
  Handle obj = HotSpotObjectConstantImpl::object(constant);
  jobject value = JNIHandles::make_local(obj());
  if (HotSpotObjectConstantImpl::compressed(constant)) {
#ifdef _LP64
    int oop_index = _oop_recorder->find_index(value);
    RelocationHolder rspec = oop_Relocation::spec(oop_index);
    _instructions->relocate(pc, rspec, 1);
#else
    JVMCI_ERROR("compressed oop on 32bit");
#endif
  } else {
    NativeMovConstReg* move = nativeMovConstReg_at(pc);
    move->set_data((intptr_t) value);

    // We need two relocations:  one on the sethi and one on the add.
    int oop_index = _oop_recorder->find_index(value);
    RelocationHolder rspec = oop_Relocation::spec(oop_index);
    _instructions->relocate(pc + NativeMovConstReg::sethi_offset, rspec);
    _instructions->relocate(pc + NativeMovConstReg::add_offset, rspec);
  }
}

// Code for unit testing implementation of NativeMovConstReg class
void NativeMovConstReg::test() {
#ifdef ASSERT
  ResourceMark rm;
  CodeBuffer cb("test", 100, 100);
  MacroAssembler* a = new MacroAssembler(&cb);
  NativeMovConstReg* nm;
  uint idx;
  int offsets[] = {
    0x0,
    0x7fffffff,
    0x80000000,
    0xffffffff,
    0x20,
    4096,
    4097,
  };

  VM_Version::allow_all();

  AddressLiteral al1(0xaaaabbbb, relocInfo::external_word_type);
  a->sethi(al1, I3);
  a->add(I3, al1.low10(), I3);
  AddressLiteral al2(0xccccdddd, relocInfo::external_word_type);
  a->sethi(al2, O2);
  a->add(O2, al2.low10(), O2);

  nm = nativeMovConstReg_at( cb.insts_begin() );
  nm->print();

  nm = nativeMovConstReg_at( nm->next_instruction_address() );
  for (idx = 0; idx < ARRAY_SIZE(offsets); idx++) {
    nm->set_data( offsets[idx] );
    assert(nm->data() == offsets[idx], "check unit test");
  }
  nm->print();

  VM_Version::revert();
#endif
}

address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object
  NativeJump*        jump = nativeJump_at(move->next_instruction_address());
  return jump->jump_destination();
}

void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {
  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object
  NativeJump*        jump = nativeJump_at(move->next_instruction_address());
  void* o = (void*)move->data();
  return o;
}

void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {
  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);
  return (void*)move->data();
}